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ISmart Defrag 3 is a FREE, light, and stable disk defragment tool, provides efficient defragmentation to hard drives for faster file loading and outstanding disk performance. It can work automatically and quietly in the background on PC, keeping hard disk running at its top speed. Smart Defrag 3 now fully supports defragmentation on Windows 8/8.1 Metro Apps which accelerates the access to Metro Apps and smoothes performance on Windows 8/8.1.